/*
 * Copyright 2019-2020 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.springframework.data.relational.core.sql;

/**
 * An expression with an alias.
 *
 * @author Jens Schauder
 * @since 1.1
 */
class AliasedExpression extends AbstractSegment implements Aliased, Expression {

	private final Expression expression;
	private final SqlIdentifier alias;

	public AliasedExpression(Expression expression, String alias) {

		super(expression);

		this.expression = expression;
		this.alias = SqlIdentifier.unquoted(alias);
	}

	public AliasedExpression(Expression expression, SqlIdentifier alias) {

		super(expression);

		this.expression = expression;
		this.alias = alias;
	}

	/*
	 * (non-Javadoc)
	 * @see org.springframework.data.relational.core.sql.Aliased#getAlias()
	 */
	@Override
	public SqlIdentifier getAlias() {
		return alias;
	}

	/*
	 * (non-Javadoc)
	 * @see java.lang.Object#toString()
	 */
	@Override
	public String toString() {
		return expression.toString() + " AS " + alias;
	}
}
